20 results about "Cellulose preparation" patented technology

The invention belongs to the technical field of cellulose preparation, and particularly relates to micro / nano cellulose based on high-shear intramolecular friction dissociation and a preparation method thereof, and the preparation method comprises the following steps: (1) crushing a cellulose raw material; (2) adding the crushed cellulose into a dilute acid solution at a preset temperature, and dissociating under the action of double-helix high-pressure homogenization to obtain a micro / nano cellulose acidic dissociation liquid; and (3) repeatedly centrifuging the micro / nano cellulose acidic dissociation liquid with deionized water until the micro / nano cellulose acidic dissociation liquid is neutral, and freeze-drying to obtain the micro / nano cellulose. According to the method, multi-selectivity natural cellulose is taken as a raw material, and the long-standing triangular problems of uneven size, overhigh energy consumption and chemical pollution in micro / nano cellulose production are solved through directional utilization of intramolecular friction energy by a double-helix high-pressure homogenization method.

The invention discloses a cell cellulose composition and application thereof in skin care products, and belongs to the technical field of cellulose preparation. According to the composition, bacterial cellulose, modified amphiphilic grafted cellulose micelles and cellulose nanocrystals are taken as cores, an isoflavone active group is grafted to a cellulose chain through an RAFT polymerization technology, an amphiphilic carrier capable of loading an oil-soluble active matter is formed, grape seed oil, resveratrol and other active ingredients can be loaded, slow release and controlled release are achieved, and the composition has a good application prospect. A bacterial cellulose three-dimensional network and nanocrystals form a protective film on the skin surface, hyaluronic acid can enhance cuticle lipid arrangement and accelerate skin barrier function reconstruction, an isoflavone grafted structure provides ultraviolet protection and anti-inflammatory pathway regulation and control, inflammatory factor release is remarkably inhibited, and the anti-inflammatory effect is achieved. A cellulose nanocrystal and bacterial cellulose composite network is provided to improve the stability of the emulsion, the problem that a traditional product is prone to layering is solved, and the emulsion has the effects of physical barrier, long-acting moisturizing and repairing and is suitable for anti-allergy repairing type skin care products such as essence and masks.

This invention discloses a method for preparing a lignin-coated cellulose nanofiber sodium-ion battery separator, relating to the fields of electrochemistry and battery separator technology. The preparation method includes: pretreating bamboo particles using a hydrothermal method; subsequently, nano-sizing the bamboo particles using a mechanical dissociation method to obtain a lignin-coated cellulose nanofiber suspension; and then forming a thin film from the lignin-coated cellulose nanofibers using a vacuum filtration method. The lignin nanoparticle-coated cellulose preparation process used in this invention is direct, simple, efficient, and environmentally friendly, eliminating the need for chemical reagents such as acids and alkalis to remove hemicellulose and lignin. Furthermore, the lignin nanoparticle coating effectively improves the diffusion rate of sodium ions during charge and discharge, as well as the discharge specific capacity and cycle stability.

The invention discloses a bamboo cellulose preparation raw material inventory management system based on a block chain, particularly relates to the field of chain inventory management, and is used for solving the problems of quality attenuation, cross-warehouse allocation and low transaction triggering intelligence degree of traditional bamboo cellulose raw materials in a storage cycle. The method comprises the following steps: constructing a raw material digital fingerprint by collecting core physical characteristics and batch information of a bamboo cellulose raw material; predicting the quality change of the next transaction time window based on the quality dynamic attenuation model in combination with the storage environment parameters, and exposing the risk in advance; when the attenuation amplitude exceeds a threshold value, automatically entering on-chain auction, and electing a transaction object according to anonymous bidding and reputation weight; and for the inventory of the continuous flow beat, calculating an allocation priority index through a global inventory map and automatically executing cross-warehouse allocation. According to the mechanism, credible recording, dynamic early warning and automatic decision making of the whole inventory management process are achieved, and the raw material circulation efficiency and the quality management capability under multi-warehouse cooperation are improved.

The present invention belongs to daily life necessary field, and specifically provides herein below biodegradable diaper / sanitary pad from sugar cane bagasse and the process thereof. The sanitary pads described above is used to manage menstrual flow during menstruation, providing a hygienic and comfortable way to absorb menstrual fluid. Specifically the process comprising of pre-treatment and delignification of sugarcane bagasse, Nano-cellulose preparation and modification, integrating zinc oxide (ZnD) nanoparticles with sugar cane bagasse, pad layering and structural design.

The invention belongs to the field of cellulose preparation, and particularly relates to a method for preparing nano cellulose based on cumin straw and application of the method in Pickering emulsion. According to the method, agricultural waste cumin straw is taken as a raw material, nano-crystalline cellulose (CSNc) is prepared through a multi-stage process of alkali treatment, oxidation bleaching and acid hydrolysis, and the effect of the nano-crystalline cellulose on stabilizing cumin oil Pickering emulsion is researched. A sulfuric acid hydrolysis process is optimized through a single factor experiment and a response surface method (Box-Behnken design), the optimal conditions are determined as follows: the sulfuric acid concentration is 60%, the temperature is 50 DEG C, the time is 55 min, and the CSNc yield reaches 5.57 + / -0.21% at the moment. TEM characterization shows that CSNc is of a rod-like nanostructure, the average width is 16.93 nm, the length is 253.06 nm, the absolute value of surface Zeta potential is high (zeta is equal to 45.6 mV), and it is indicated that CSNc has good colloidal stability. The CSNc is applied to a cumin oil emulsion system, the oil-in-water (O / W) Pickering emulsion is successfully prepared, and the particle sizes of liquid drops of the emulsion are uniform.

The invention discloses polyanionic cellulose for petroleum drilling and a preparation method thereof, and belongs to the technical field of polyanionic cellulose preparation. The method comprises the steps of cellulose activation, silane grafting, NaA type molecular sieve in-situ growth and post-treatment. Activated cellulose is subjected to amination modification through a silane coupling agent KH-792, then a NaA type molecular sieve is grown on a cellulose skeleton in situ through a microwave hydrothermal method, and a stable inorganic-organic hybrid structure is formed. The structure can construct a cellulose-molecular sieve three-dimensional physical cross-linked network in a solution, synergistically exerts the effects of ion fixation, heat shielding and moisture slow release of the molecular sieve, effectively solves the problems of rapid viscosity reduction and filtration loss control failure of traditional PAC in a high-temperature and high-salt environment, and is suitable for severe drilling conditions of deep wells, ultra-deep wells and the like.

The present invention relates to the technical field related to the processing of acetic acid plates, specifically to the processing technology of acetic acid plates. The processing technology of acetic acid plates includes a cellulose preparation process, a cellulose dissolution process, a cellulose regeneration process, a cellulose fibrillation process, and a fiberboard forming process. In the cellulose preparation process, wood with a certain cellulose content and cellulose quality is selected as the raw material, and the raw material is cut, ground, and screened. Then, the screened material is added into a reaction kettle. The reaction kettle includes a kettle body, a rotating shaft, stirring blades, and an acid supply pipeline; by setting up a reaction kettle composed of a combination of a kettle body, a rotating shaft, stirring blades, and an acid supply pipeline, a main liquid cavity is opened on the rotating shaft, a secondary liquid cavity is opened on the stirring rod on the side wall of the rotating shaft, and a liquid outlet hole is opened on the secondary liquid cavity, so that acetic acid liquid can be directly and evenly transported into the kettle body, thereby improving the distribution speed of acetic acid and ensuring the reaction effect.

The invention belongs to the technical field of high-value utilization of biomass resources, and particularly relates to a straw-based nano cellulose preparation method, which comprises four steps of straw powder preparation, hydrothermal pretreatment, deep eutectic solvent treatment and high-pressure homogenization-pulse ultrasonic cooperative treatment, and straw nano cellulose is prepared in a green and efficient manner. The straw which is wide in source and low in price is used as the raw material, the dosage and energy consumption of chemical reagents are remarkably reduced through coupling of hydrothermal pretreatment, a deep-eutectic solvent system and a high-pressure homogenization synergistic pulse ultrasonic technology, the high-performance nano cellulose is prepared, and the high-performance nano cellulose can be widely applied to the fields of flexible electronic substrates, food packaging films, drug sustained-release carriers and the like and has a wide application prospect in the fields of flexible electronic substrates, food packaging films, drug sustained-release carriers and the like. The method has both environmental benefits and economic values, and provides a new way for high-value utilization of agricultural wastes.

The invention relates to the technical field of cellulose preparation, and discloses a cellulose-based material for adsorbing and desorbing micro-plastics as well as a preparation method and application of the cellulose-based material. The preparation method comprises the following steps: (1) bamboo is cut off and then placed in alkali liquor to be soaked, washed to be neutral and then placed in a hydrogen peroxide solution to be bleached, and bamboo powder is obtained after the bamboo is taken out, dried and smashed; 2) adding the bamboo powder into a mixed aqueous solution of urea and sodium hydroxide, and stirring to obtain slurry; continuously stirring the slurry at the pressure of 0.5-1.5 MPa and the temperature of 80-120 DEG C, and cooling to room temperature to obtain a mixed solution; and 3) adding the mixed solution into an acetic acid solution to react, filtering, washing and drying to obtain the product. According to the preparation method, the problems that in the prior art, bamboo cellulose is difficult to dissolve, the preparation cost is high, the bamboo cellulose is not friendly to the environment, and the product quality is prone to being affected can be solved, efficient, low-cost and environment-friendly preparation of the high-quality dissolved bamboo cellulose is achieved, and the application range of the bamboo cellulose in adsorption and desorption of micro-plastics is widened.

The present application is suitable for the technical field of microcrystalline cellulose and high polymerization degree cellulose preparation, and provides a combined preparation process of microcrystalline cellulose and high polymerization degree cellulose, which comprises the following steps: step (1), pretreatment; step (2), cooking; step (3), black liquor extraction; step (4), bleaching and pulp washing; step (5), grading; step (6), mixing, reaction and dilution; step (7), washing; step (8), pressure filtration and concentration; and step (9), drying, crushing and screening. The present application grades the bleached cellulose by using a grading screen, separates the component consisting of short fibers and miscellaneous cells which can produce microcrystalline cellulose and the single high polymerization degree cellulose component, then performs conventional acid hydrolysis and multi-stage countercurrent washing, concentration, drying and crushing on the short fiber and miscellaneous cell mixed component, and then grades the dried microcrystalline cellulose product by using various dry grading equipment, separates the acid hydrolysis microcrystalline cellulose product consisting of short fiber component for sale, and separates the acid hydrolysis microcrystalline cellulose component consisting of miscellaneous cell component for sale as a byproduct of special microcrystalline cellulose.

The invention belongs to the technical field of cellulose preparation, and particularly relates to hydrophobic cellulose and a hydrophobic modification method thereof. In order to solve the problems that an existing cellulose hydrophobic modification method is complex, and chemical reagents are not environmentally friendly, the invention provides a cellulose hydrophobic modification method which comprises the following steps: adding cellulose into a mixed acid modifier for esterification reaction, and then washing with water, the ratio of the cellulose to the mixed acid is (30-100): 1 g / L; the mixed acid system is prepared from 15 to 25 weight percent of HNO3, 35 to 50 weight percent of H2SO4 and 30 to 40 weight percent of water. Water-proof and oil-proof test results show that the water-proof and oil-proof effects of the modified cellulose can reach higher levels, so that the modified cellulose has a better hydrophobic effect. Therefore, the hydrophobic cellulose obtained by the modification method has potential commercial value in replacing plastic packaging and disposable environment-friendly products.

The invention relates to the technical field of cellulose processing, in particular to a low-viscosity polyanionic cellulose preparation device and a preparation process thereof.The low-viscosity polyanionic cellulose preparation device comprises multiple rows of rake rods, a rake shaft, two discharging plates and a reaction tank fixedly installed on a frame. The end part of the rake rod can be in contact with the inner wall of the reaction tank, so that the phenomenon of bottom pasting is avoided. And after drying is completed, the discharging plate is pushed, so that the dried cellulose is discharged. The edge of the discharging plate cannot be penetrated, the whole discharging plate can be pushed, and when the rake rod moves, the rake rod rotates along the rotating column through the inclined groove, so that the end of the rake rod rotates to be parallel to the axis of the rake shaft, the situation that the end of the rake rod is too long, and consequently an avoiding hole is formed to be large is avoided, and the residual quantity generated when the fiber bundles are pushed for the first time is reduced; and the dried cellulose can be conveniently discharged. And the discharge plate is pushed in the manner, so that the number of the rake rods is not limited, and the length of the reaction tank can be freely controlled.

The invention relates to a nano-cellulose preparation device, wood nano-cellulose and a preparation method of the wood nano-cellulose. The nanocellulose preparation device comprises a pretreatment assembly, a micro-nanocrystallization assembly, a nanocrystallization assembly and a finished product collection part which are connected in sequence; the pretreatment assembly comprises a first storage part and a pretreatment part which are connected in sequence; the micro-nanocrystallization assembly comprises a second material storage part and a micro-nanocrystallization treatment part which are connected in sequence; the nanocrystallization assembly comprises at least three homogenizing components which are connected in series; the continuous mass production of the nanocellulose is realized, the nanocrystallization treatment times are reduced, the production energy consumption and the abrasion to equipment are reduced, and the production cost is reduced; according to the lignin-containing wood nanocellulose prepared by the preparation method, the diameter is as small as 10-90 nm, the content of the nanocellulose with the length smaller than or equal to 3 microns and the diameter smaller than 100 nm is larger than or equal to 85%, the lignin content is larger than or equal to 5 wt%, the lignin-containing wood nanocellulose has the excellent performance of both lignin and nanocellulose, and the preparation process is simple, environmentally friendly and free of pollution.

The invention relates to the technical field of nanocellulose, and discloses a preparation method and application of nanocellulose, cellulose is weighed and poured into a beaker, the beaker is placed in a constant-temperature water area of a constant-temperature magnetic stirrer, and an H2SO4 solution is slowly poured into the beaker; putting the fusiform rotor into a beaker, then starting a magnetic stirrer, stirring the suspension in the beaker, taking out the beaker after reaction, and adding deionized water for dilution to finish the reaction; centrifuging the diluted suspension at a rotating speed, pouring out supernate after centrifuging, and removing acid in the suspension; adding deionized water for repeated centrifugal washing until an upper solution obtained after centrifugation is turbid suspension, putting the suspension into a dialysis bag, and dialyzing in the deionized water until the pH value of dialysate is neutral; and taking out the liquid in the dialysis bag, centrifuging, taking the upper-layer suspension, and drying in a drying oven to obtain the nano cellulose. The nano cellulose solves the problems of high energy consumption and low efficiency of the existing cellulose preparation.

The application discloses a kind of intelligent automation feeding and discharging system suitable for cellulose, and it relates to the field of new solvent method cellulose preparation.The system includes upper and lower communication variable-diameter feeding channel and blanking main channel, high-end communication blanking main channel upper part right side face side open, low-end and external warehousing system communication discharging chute assembly, automatic baffle valve assembly installed in blanking main channel inner chamber, switch between working station and auxiliary station, intelligent cleaning mechanism around blanking main channel, and DCS control system.The application is designed with two material channels, and the automatic baffle valve assembly is automatically turned over by linkage control to realize flexible switching between working station and auxiliary station, to meet the intelligent automatic conversion between normal production state and process debugging, maintenance or cleaning and other abnormal production state, to realize intelligent automatic cleaning by linkage control of intelligent cleaning mechanism opening and closing, to provide protection for realizing unmanned workshop and green workshop.

The application discloses a preparation method of cross-linked cellulose fiber and belongs to the technical field of cellulose preparation. The method comprises the following steps: adding a cross-linking agent solution and a catalyst solution to Lyocell fiber, and preliminarily solidifying at a first set temperature to obtain preliminarily solidified Lyocell fiber, wherein the mass percentage of the cross-linking agent solute in the cross-linking agent solution is 0.1% to 10%, defined as a; the mass percentage of the catalyst solute in the catalyst solution is (0-5%)x a; the solidified Lyocell fiber is washed at a second set temperature to change the electron cloud density distribution of the solidified Lyocell fiber, deep solidification is completed, and deep solidified Lyocell fiber is obtained; and the deep solidified Lyocell fiber is subjected to post-treatment to obtain cross-linked cellulose fiber. The method can improve the uniformity of cross-linking and the product quality.

The invention discloses a hydroxy propyl cellulose solution with a fiber reinforcing function and a preparation method and application thereof, and belongs to the field of hydroxy propyl cellulose preparation.The method comprises the steps that hydroxy propyl cellulose and 3-glycidyl ether oxypropyl trimethoxy silane are evenly mixed according to the mass ratio of 10: (1-5), then heating treatment is conducted, and the hydroxy propyl cellulose solution with the fiber reinforcing function is obtained; the powdery modified hydroxy propyl cellulose is obtained; and dissolving the modified hydroxy propyl cellulose in deionized water or an organic solvent to obtain a hydroxy propyl cellulose solution with a fiber reinforcement function. The preparation method is simple in process, easy to implement and low in cost, and hydroxy propyl cellulose is modified by using the silane coupling agent KH560, so that the binding power of the hydroxy propyl cellulose and the crosslinking strength of the hydroxy propyl cellulose and various plant fibers are enhanced, and the performance of the hydroxy propyl cellulose is stable.

The invention discloses temperature-resistant and salt-resistant polyanionic cellulose and a preparation method thereof, and belongs to the technical field of polyanionic cellulose preparation. The method comprises the following steps: activating bleached wood pulp or cotton pulp cellulose by using low-concentration NaOH, and grafting in an alcohol-water system by using gamma-aminoethyl-gamma-aminopropyl trimethoxy silane (KH-792), so as to obtain aminated cellulose; then adding the aminated cellulose into the UiO-66-NH2 precursor sol, and carrying out microwave in-situ growth of an MOF crystal shell to form a core-shell structure; and finally, freeze-drying to construct the hierarchical porous aerogel, and crushing to obtain the finished product. Furthermore, ion exchange can be further carried out through a CaCl solution, so that Ca-UiO-66-NH2 (at) Cellulose is obtained. The apparent viscosity of 1 wt% of the product in saturated salt water is greater than or equal to 65 mPa.s, the viscosity retention rate after aging at 180 DEG C for 16 h is greater than or equal to 90%, the API filter loss is less than or equal to 6 mL, and the product is suitable for filtrate loss reduction and viscosity improvement of the deep well high-calcium drilling fluid, and has temperature resistance, salt resistance and environmental protection performance comprehensively superior to those of commercially available PAC.

The invention discloses cellulose and a preparation method thereof, and belongs to the technical field of cellulose preparation. Comprising the following steps: sequentially cleaning and drying plant raw materials, and crushing to obtain plant raw material particles; mixing the plant raw material particles with a strong alkali solution to obtain high-alkalinity plant primary pulp; adding water to dilute the high-alkalinity plant primary pulp, and then adding amylase for catalytic desizing to obtain desized plant primary pulp; adding a bleaching agent into the desized plant primary pulp to obtain bleached plant primary pulp; carrying out post-treatment on the bleached plant primary pulp to obtain pure plant fibers; and sequentially fermenting, extracting and refining the pure plant fibers to obtain the high-purity cellulose. After desized plant raw stock is bleached, the bleached plant raw stock is subjected to post-treatment, and through the steps of extrusion filtration, precipitation, washing and the like, fine impurities and excessive water in the plant fiber raw material are removed, and the purity of the cellulose raw material is improved.